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hugo7
NB - not a bamboo expert
Looks like yours is in a pot? So I think you will want to be thinning it every year anyway, to slow down how quickly it will outgrow the pot by getting rootbound.
If you want it to be taller, obviously begin by thinning the shortest ones, cutting them off at ground level. I would take them out in a random pattern, not just in the centre.
Because I am a cautious carrot I would take out no more than about 20% in the first year.